user
Write a response that appropriately completes the request.

### Instruction:
Create an analogy to explain the structure of solar system.

### Response:
assistant
The structure of the solar system can be compared to a wheel, with the Sun at the center. The planets each hold a "spoke" position, orbiting the wheel at varying distances from the central star. The asteroids occupy a similar position but at much greater distances from the Sun. The wheel is further held in place by two important forces--gravity, acting from within, and the just-as-powerful force of momentum pushing from the outside, aiding in momentum and balance.